During pregnancy, whatever the mother eats, drinks, or smokes ultimately is passed from her bloodstream through the placenta to the baby’s bloodstream. Imagine what it must do to the rapidly dividing cells of an early fetus. According to the interview in Smoking and Pregnancy what is the main direct effect on the developing embryo of mother’s smoking during pregnancy? Is it:

mental retardation low birth weight extra fingers and toes

Can secondary problems result if the baby is born too small?